Obscure FBI Unit Does The Domestic Spying That The NSA Can't

Meet The Spies Who Are Really Tapping Your Phone
US Senator Chris Murphy, Democrat of Connecticut, sits during an interview in his office on Capitol Hill November 21, 2013 in Washington, DC. Murphy is planning to travel to Europe to discuss concerns over spying on US allies by the National Security Agency. AFP PHOTO/Brendan SMIALOWSKI (Photo credit should read BRENDAN SMIALOWSKI/AFP/Getty Images)
US Senator Chris Murphy, Democrat of Connecticut, sits during an interview in his office on Capitol Hill November 21, 2013 in Washington, DC. Murphy is planning to travel to Europe to discuss concerns over spying on US allies by the National Security Agency. AFP PHOTO/Brendan SMIALOWSKI (Photo credit should read BRENDAN SMIALOWSKI/AFP/Getty Images)

With every fresh leak, the world learns more about the U.S. National Security Agency's massive and controversial surveillance apparatus. Lost in the commotion has been the story of the NSA's indispensable partner in its global spying operations: an obscure, clandestine unit of the Federal Bureau of Investigation that, even for a surveillance agency, keeps a low profile.

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